Analysis of Changes in the Micromorphology of Sandstone Joint Surface under Dry-Wet Cycling

<table class="table-group" id="tab5"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left">Number of dry-wet cycles (<i>n</i>)</td><td class="align_center"><i>ϕ</i><sub>b</sub> (°)</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">0</td><td class="align_center">27.45</td></tr><tr><td class="align_left">1</td><td class="align_center">27.00</td></tr><tr><td class="align_left">3</td><td class="align_center">26.67</td></tr><tr><td class="align_left">5</td><td class="align_center">26.28</td></tr><tr><td class="align_left">8</td><td class="align_center">25.69</td></tr><tr><td class="align_left">12</td><td class="align_center">25.25</td></tr><tr><td class="align_left">16</td><td class="align_center">25.06</td></tr><tr><td class="align_left">20</td><td class="align_center">25.00</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The basic internal friction angle <svg height="12.3916pt" id="M16" style="vertical-align:-3.42948pt" version="1.1" viewbox="-0.0498162 -8.96212 12.2842 12.3916" width="12.2842pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M542 242C542 369 469 429 379 468C370 472 372 496 376 513L416 681L400 691L344 648L219 51C167 69 113 128 113 217C113 324 166 387 266 428L252 459C124 418 23 336 23 202C23 95 90 13 205 -8L182 -132C165 -222 191 -254 209 -261L215 -258L270 -7C415 -4 542 98 542 242ZM469 232C469 126 403 33 279 39L355 409C399 394 469 331 469 232Z"></path></g><g transform="matrix(.0091,0,0,-0.0091,7.02,3.132)"><path d="M152 404V712C115 698 54 683 7 677V654C71 648 73 642 73 579V24C128 -2 179 -12 220 -12C353 -12 471 92 471 238C471 357 381 449 274 449C262 449 249 446 233 439L152 404ZM152 374C170 384 202 393 230 393C313 393 382 326 382 213C382 97 330 26 246 26C194 26 165 62 158 81C154 91 152 101 152 116V374Z"></path></g></svg> of joint surface under dry-wet cycling.</div>

Advances in Materials Science and Engineering

tab5

Table 5

Table 5: Analysis of Changes in the Micromorphology of Sandstone Joint Surface under Dry-Wet Cycling 